- Reworked the tenant admin login page

- Updated the User model to implement Filament’s tenancy contracts
- Seeded a ready-to-use demo tenant (user, tenant, active package, purchase)
- Introduced a branded, translated 403 error page to replace the generic forbidden message for unauthorised admin hits
- Removed the public “Register” links from the marketing header
- hardened join event logic and improved error handling in the guest pwa.

docs/screenshots/tenant-admin-onboarding/04-order-summary.svg

@@ -0,0 +1,53 @@
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+  <g transform="translate(80,80)">
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+    <text x="40" y="80" font-size="48" font-family="Inter, Arial, sans-serif" font-weight="700" fill="#f8fafc">
+      Bestellübersicht
+    </text>
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+      Paket: Pro – 3 Events, 1000 Uploads
+    </text>
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+      Zahlungsart: Stripe oder PayPal
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+    <text x="40" y="280" font-size="24" font-family="Inter, Arial, sans-serif" fill="#60a5fa">
+      Zwischensumme
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+    <text x="360" y="280" font-size="32" font-family="Inter, Arial, sans-serif" font-weight="700" fill="#60a5fa">
+      79 €
+    </text>
+    <text x="40" y="340" font-size="24" font-family="Inter, Arial, sans-serif" fill="#f472b6">
+      Gesamt (inkl. MwSt)
+    </text>
+    <text x="360" y="340" font-size="36" font-family="Inter, Arial, sans-serif" font-weight="700" fill="#f472b6">
+      94,01 €
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+    <text x="70" y="462" font-size="26" font-family="Inter, Arial, sans-serif" fill="#ffffff">
+      Weiter zum Setup
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+      Stripe-Elemente
+    </text>
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+      Kartennummer, Ablaufdatum, CVC, Kartenhalter
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+</svg>